Currently if you try to go in the back way for Rite of Undeath, through the Disciples of Necromancy node… well you can’t. It need’s 3 connector points and the Rite node only has 1 point. See picture link.
You can get 3 connectors from Blades of Undeath; the northern equivalent to Disciples, but you need both northern and southern nodes (Blades and Disciples) to turn the Rite node on.